1 /*- 2 * Copyright (c) 1990, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Hugh Smith at The University of Guelph. 7 * 8 * %sccs.include.redist.c% 9 */ 10 11 #ifndef lint 12 static char sccsid[] = "@(#)archive.c 8.4 (Berkeley) 04/27/95"; 13 #endif /* not lint */ 14 15 #include <sys/param.h> 16 #include <sys/stat.h> 17 18 #include <ar.h> 19 #include <dirent.h> 20 #include <err.h> 21 #include <errno.h> 22 #include <fcntl.h> 23 #include <stdio.h> 24 #include <stdlib.h> 25 #include <string.h> 26 #include <unistd.h> 27 28 #include "archive.h" 29 #include "extern.h" 30 31 typedef struct ar_hdr HDR; 32 static char hb[sizeof(HDR) + 1]; /* real header */ 33 34 int 35 open_archive(mode) 36 int mode; 37 { 38 int created, fd, nr; 39 char buf[SARMAG]; 40 41 created = 0; 42 if (mode & O_CREAT) { 43 mode |= O_EXCL; 44 if ((fd = open(archive, mode, DEFFILEMODE)) >= 0) { 45 /* POSIX.2 puts create message on stderr. */ 46 if (!(options & AR_C)) 47 warnx("creating archive %s", archive); 48 created = 1; 49 goto opened; 50 } 51 if (errno != EEXIST) 52 error(archive); 53 mode &= ~O_EXCL; 54 } 55 if ((fd = open(archive, mode, DEFFILEMODE)) < 0) 56 error(archive); 57 58 /* 59 * Attempt to place a lock on the opened file - if we get an 60 * error then someone is already working on this library (or 61 * it's going across NFS). 62 */ 63 opened: if (flock(fd, LOCK_EX|LOCK_NB) && errno != EOPNOTSUPP) 64 error(archive); 65 66 /* 67 * If not created, O_RDONLY|O_RDWR indicates that it has to be 68 * in archive format. 69 */ 70 if (!created && 71 ((mode & O_ACCMODE) == O_RDONLY || (mode & O_ACCMODE) == O_RDWR)) { 72 if ((nr = read(fd, buf, SARMAG) != SARMAG)) { 73 if (nr >= 0) 74 badfmt(); 75 error(archive); 76 } else if (bcmp(buf, ARMAG, SARMAG)) 77 badfmt(); 78 } else if (write(fd, ARMAG, SARMAG) != SARMAG) 79 error(archive); 80 return (fd); 81 } 82 83 void 84 close_archive(fd) 85 int fd; 86 { 87 88 (void)close(fd); /* Implicit unlock. */ 89 } 90 91 /* Convert ar header field to an integer. */ 92 #define AR_ATOI(from, to, len, base) { \ 93 memmove(buf, from, len); \ 94 buf[len] = '\0'; \ 95 to = strtol(buf, (char **)NULL, base); \ 96 } 97 98 /* 99 * get_arobj -- 100 * read the archive header for this member 101 */ 102 int 103 get_arobj(fd) 104 int fd; 105 { 106 struct ar_hdr *hdr; 107 int len, nr; 108 char *p, buf[20]; 109 110 nr = read(fd, hb, sizeof(HDR)); 111 if (nr != sizeof(HDR)) { 112 if (!nr) 113 return (0); 114 if (nr < 0) 115 error(archive); 116 badfmt(); 117 } 118 119 hdr = (struct ar_hdr *)hb; 120 if (strncmp(hdr->ar_fmag, ARFMAG, sizeof(ARFMAG) - 1)) 121 badfmt(); 122 123 /* Convert the header into the internal format. */ 124 #define DECIMAL 10 125 #define OCTAL 8 126 127 AR_ATOI(hdr->ar_date, chdr.date, sizeof(hdr->ar_date), DECIMAL); 128 AR_ATOI(hdr->ar_uid, chdr.uid, sizeof(hdr->ar_uid), DECIMAL); 129 AR_ATOI(hdr->ar_gid, chdr.gid, sizeof(hdr->ar_gid), DECIMAL); 130 AR_ATOI(hdr->ar_mode, chdr.mode, sizeof(hdr->ar_mode), OCTAL); 131 AR_ATOI(hdr->ar_size, chdr.size, sizeof(hdr->ar_size), DECIMAL); 132 133 /* Leading spaces should never happen. */ 134 if (hdr->ar_name[0] == ' ') 135 badfmt(); 136 137 /* 138 * Long name support. Set the "real" size of the file, and the 139 * long name flag/size. 140 */ 141 if (!bcmp(hdr->ar_name, AR_EFMT1, sizeof(AR_EFMT1) - 1)) { 142 chdr.lname = len = atoi(hdr->ar_name + sizeof(AR_EFMT1) - 1); 143 if (len <= 0 || len > MAXNAMLEN) 144 badfmt(); 145 nr = read(fd, chdr.name, len); 146 if (nr != len) { 147 if (nr < 0) 148 error(archive); 149 badfmt(); 150 } 151 chdr.name[len] = 0; 152 chdr.size -= len; 153 } else { 154 chdr.lname = 0; 155 memmove(chdr.name, hdr->ar_name, sizeof(hdr->ar_name)); 156 157 /* Strip trailing spaces, null terminate. */ 158 for (p = chdr.name + sizeof(hdr->ar_name) - 1; *p == ' '; --p); 159 *++p = '\0'; 160 } 161 return (1); 162 } 163 164 static int already_written; 165 166 /* 167 * put_arobj -- 168 * Write an archive member to a file. 169 */ 170 void 171 put_arobj(cfp, sb) 172 CF *cfp; 173 struct stat *sb; 174 { 175 int lname; 176 char *name; 177 struct ar_hdr *hdr; 178 off_t size; 179 180 /* 181 * If passed an sb structure, reading a file from disk. Get stat(2) 182 * information, build a name and construct a header. (Files are named 183 * by their last component in the archive.) If not, then just write 184 * the last header read. 185 */ 186 if (sb) { 187 name = rname(cfp->rname); 188 (void)fstat(cfp->rfd, sb); 189 190 /* 191 * If not truncating names and the name is too long or contains 192 * a space, use extended format 1. 193 */ 194 lname = strlen(name); 195 if (options & AR_TR) { 196 if (lname > OLDARMAXNAME) { 197 (void)fflush(stdout); 198 warnx("warning: %s truncated to %.*s", 199 name, OLDARMAXNAME, name); 200 (void)fflush(stderr); 201 } 202 (void)sprintf(hb, HDR3, name, sb->st_mtimespec.ts_sec, 203 sb->st_uid, sb->st_gid, sb->st_mode, sb->st_size, 204 ARFMAG); 205 lname = 0; 206 } else if (lname > sizeof(hdr->ar_name) || strchr(name, ' ')) 207 (void)sprintf(hb, HDR1, AR_EFMT1, lname, 208 sb->st_mtimespec.ts_sec, sb->st_uid, sb->st_gid, 209 sb->st_mode, sb->st_size + lname, ARFMAG); 210 else { 211 lname = 0; 212 (void)sprintf(hb, HDR2, name, sb->st_mtimespec.ts_sec, 213 sb->st_uid, sb->st_gid, sb->st_mode, sb->st_size, 214 ARFMAG); 215 } 216 size = sb->st_size; 217 } else { 218 lname = chdr.lname; 219 name = chdr.name; 220 size = chdr.size; 221 } 222 223 if (write(cfp->wfd, hb, sizeof(HDR)) != sizeof(HDR)) 224 error(cfp->wname); 225 if (lname) { 226 if (write(cfp->wfd, name, lname) != lname) 227 error(cfp->wname); 228 already_written = lname; 229 } 230 copy_ar(cfp, size); 231 already_written = 0; 232 } 233 234 /* 235 * copy_ar -- 236 * Copy size bytes from one file to another - taking care to handle the 237 * extra byte (for odd size files) when reading archives and writing an 238 * extra byte if necessary when adding files to archive. The length of 239 * the object is the long name plus the object itself; the variable 240 * already_written gets set if a long name was written. 241 * 242 * The padding is really unnecessary, and is almost certainly a remnant 243 * of early archive formats where the header included binary data which 244 * a PDP-11 required to start on an even byte boundary. (Or, perhaps, 245 * because 16-bit word addressed copies were faster?) Anyhow, it should 246 * have been ripped out long ago. 247 */ 248 void 249 copy_ar(cfp, size) 250 CF *cfp; 251 off_t size; 252 { 253 static char pad = '\n'; 254 off_t sz; 255 int from, nr, nw, off, to; 256 char buf[8*1024]; 257 258 if (!(sz = size)) 259 return; 260 261 from = cfp->rfd; 262 to = cfp->wfd; 263 sz = size; 264 while (sz && (nr = read(from, buf, MIN(sz, sizeof(buf)))) > 0) { 265 sz -= nr; 266 for (off = 0; off < nr; nr -= off, off += nw) 267 if ((nw = write(to, buf + off, nr)) < 0) 268 error(cfp->wname); 269 } 270 if (sz) { 271 if (nr == 0) 272 badfmt(); 273 error(cfp->rname); 274 } 275 276 if (cfp->flags & RPAD && (size + chdr.lname) & 1 && 277 (nr = read(from, buf, 1)) != 1) { 278 if (nr == 0) 279 badfmt(); 280 error(cfp->rname); 281 } 282 if (cfp->flags & WPAD && (size + already_written) & 1 && 283 write(to, &pad, 1) != 1) 284 error(cfp->wname); 285 } 286 287 /* 288 * skip_arobj - 289 * Skip over an object -- taking care to skip the pad bytes. 290 */ 291 void 292 skip_arobj(fd) 293 int fd; 294 { 295 off_t len; 296 297 len = chdr.size + (chdr.size + chdr.lname & 1); 298 if (lseek(fd, len, SEEK_CUR) == (off_t)-1) 299 error(archive); 300 } 301